But everyone has their opinion, right? But they didn't say anything about chances. But yeah, I used to agree with that.
I cannot find the exact post, but I remember very clearly Bonnie Anne stating that the chances for receiving a companion from the Tribal Crew or Grizzly Beast pack could quite possibly be 1/100*, and that is the rate for every pack you buy. So it is not guaranteed you would receive 1 companion if you bought 100 packs, but rather a 1% chance in every pack of finding one of those much coveted dinos or bears.
Yes, your math does make sense, but sadly it does not (as far as I know, that is) apply to these drop rates. If it did, I'd have at least one of the pack companions.
*It has been mentioned several times by One-Eyed Jack, Ratbeard, and Bonnie Anne that they would not release drop rates for items, so perhaps this percentage is incorrect. Only the folks at KI know these things for sure.